1340321 has 2 divisors, whose sum is σ = 1340322. Its totient is φ = 1340320.

The previous prime is 1340291. The next prime is 1340323. The reversal of 1340321 is 1230431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 130321 = 1100^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340321 - 2¹⁰ = 1339297 is a prime.

Together with 1340323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340296 and 1340305.

It is not a weakly prime, because it can be changed into another prime (1340323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670160 + 670161.

It is an arithmetic number, because the mean of its divisors is an integer number (670161).

2^1340321 is an apocalyptic number.

It is an amenable number.

1340321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340321 is an equidigital number, since it uses as much as digits as its factorization.

1340321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1340321 is about 1157.7223328588. The cubic root of 1340321 is about 110.2561797775.

Adding to 1340321 its reverse (1230431), we get a palindrome (2570752).

It can be divided in two parts, 1340 and 321, that added together give a palindrome (1661).

The spelling of 1340321 in words is "one million, three hundred forty thousand, three hundred twenty-one".